I have 4 columns: Name, Week, Batch and Units Produced (Cols, A,B,C,D). In column E, I need to keep running totals based on name and week. When the week changes for the same person, restart the total.

```
Fred, 12, 4001, 129.0 Answer in e: 129.0
Fred, 12, 4012, 234.0 Answer in e: 363.0
Fred, 13, 4023, 12.0 Answer in e: 12.0
John, 12, 4003, 420.0 Answer in e: 420.0
John, 13, 4021, 1200.0 Answer in e: 1200.0
John, 13, 4029, 120.0 Answer in e: 1320.0
```

I need to be able to copy the formula to over 1000 rows.